Add viewing of error messages from Keystone upon self-update failure.

chrome/browser/mac/keystone_registration.mm

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/mac/keystone_registration.h"
 
 namespace keystone_registration {
 
 // Definitions of the Keystone registration constants needed here. From
 // KSRegistration.m.
@@ skipping 13 matching lines @@
 
 NSString* KSRegistrationDidCompleteNotification =
     @"KSRegistrationDidCompleteNotification";
 NSString* KSRegistrationPromotionDidCompleteNotification =
     @"KSRegistrationPromotionDidCompleteNotification";
 
 NSString* KSRegistrationCheckForUpdateNotification =
     @"KSRegistrationCheckForUpdateNotification";
 NSString* KSRegistrationStatusKey = @"Status";
 NSString* KSRegistrationUpdateCheckErrorKey = @"Error";
+NSString* KSRegistrationUpdateCheckRawResultsKey = @"RawResults";
+NSString* KSRegistrationUpdateCheckRawErrorMessagesKey = @"RawErrorMessages";
 
 NSString* KSRegistrationStartUpdateNotification =
     @"KSRegistrationStartUpdateNotification";
 NSString* KSUpdateCheckSuccessfulKey = @"CheckSuccessful";
 NSString* KSUpdateCheckSuccessfullyInstalledKey = @"SuccessfullyInstalled";
 
 NSString* KSRegistrationRemoveExistingTag = @"";
 
 NSString* KSReportingAttributeValueKey = @"value";
 NSString* KSReportingAttributeExpirationDateKey = @"expiresAt";
 NSString* KSReportingAttributeAggregationTypeKey = @"aggregation";
 
 }  // namespace keystone_registration